Ring balance



Aug. 1, 1933- P. RHEINLNDER RING BALANCE Filed Sep. 15 19251 25 the diierential pressure acting on the ring bal- 30 .simple pressure meters a rectilinear relation, and

Patented Aug. 1, 1933 l UNITED STAT-Es PATENT OFFICE RING BALANCE Paul Rheinlnder, Altena in Westfalen, Germany, assignor to Paul de Bruyn, Dusseldorf, Germany Application September 16, 1931, Serial No.

' 563,134, and in Germany July 8, 1929 This invention relates to improvements in dif- In practice the' conduits 6, 7 are flexible and are ferential gages of the kind known commonly as usually made of rubber. Such construction is ring balance meters, in which to indicate or well known and forms no part of my present inascertain the diierences in the pressures of a VentOn.

gas, iluid or liquid under pressure conveyed The ring balance-R is here shown as provided 60 through "conduits, an annular ltube which is with a pointer 8 which coacts with an indicating mounted for oscillatory movement and which has scale 9,- as is usual. Heretofore in instruments a partition therein forming chambers is employed of this kind the body of the ring has been loaded into which chambers pressure is conveyed by with eccentrically disposed weights rigidly se- 10 means of pressure conduits which discharge from cured thereto. The objections to such weights 65 the main conduit into said chambers so that the are hereinbefore stated. annular tube or ring balance is turned in one According to the invention a positive relation direction or the other according to the differences is obtained between the measuring force and the in pressure in the said conduit, displacement by suspending, by means of a guide Ring balance meters for measuring pressure link a and a second guide link b, a counterweight 70 diilerences are known in which the ring balance G. The weight is suspended from the point of is loaded with eccentrieally disposed weights connection between the links a, b and the latter rigidly secured thereto. The torsional moment link is connected at its upper end to a fixed point produced by the weight which, in the state of C which is spaced from the ring balance, the link inertia, is equal to that produced by the measura being connected to the ring balance as at A. 75 ing force, that is to say, the force produced by The weight is caused to move, when the ring balthe dinerences in pressure is positively properance is deilected, in a curved path outside the tional to the sine of the angle of displacement, ring balance, to offer resistance to the move- There is a positive sine curve relation between ment of the ring balance, as will be understood.

I The `following equation holds for the measuring 80 ance and the displacement. The disadvantage force, that is the component of the force acting of such construction is obvious, as in practice tangentially to the ring balance.

another relation between the measuring force coe-,g cos 5 and the displacement is desired, tor example with I. T= G 7- 85 with pressure meters for measurement of gas where as indicated in Figures l and 3, T 1s the velocity or quantity of ges a par-abolie one active tangential component of the force which The invention is illustrated, by way of examvin the state of inertia is in equilibrium with the ple, in the accompanying drawing in which force produced by the pressure and G is the Figure 1 is a diagrammatic sectional elevation force 0f the Weight due t0 gravity. l 90 0f a ring balance measuring apparatus embody.. is the angle between the guide link a and the ing my improvements, tangent to the circle of radius r and centre M,

Figure 2 is e deren diagrammatic elevation of which is the circular path traced by the point the seme Showing the pointer and see1e of suspension Ao on the displacement of the ring Figure 3 is a diagram of calculations involved balal- =ang1e B A E 95 in the operation of my invention 'y 1s the angle between the two guides (a and The ring balance R here shown is of usual form b) I engl? A ,B C

having the pivotal eem-,rei exis M by meens of 6 1s the angle between the guide b and the which it is mounted in bearings m; said ring 1m1-` horlzontal Ime B D; angle C B D ance or annular tube having the partition m' in The angles Y and 5 99311 be Consldered as func' 100 its upmr side so that chambers mi m3 are formed tions 0f the angle of dlsplacemenl; d (angle AO at opposite sides of said partition, into which M AV chambers conduits 6, 'I respectively discharge, IL :-l--fr-QO said conduits leading from the chambers or reservoirs 4, 5 of the conduit 1 which has a partition iii, eos fy=z+b2 (e r C028? (t Sm a h) 105 2 therein provided with a port 3 of reduced di- IV a ameter and through which conduit 1 the gases, fluids or liquids under pressure, the diiferential where of the static heads of which it is desired to measa is the length of the rst guide link,

- ure, pass, as is usual in apparatus oi!v this kind. b is the length of the second guide link, i 110 e=M F, is the distance between the point C and the middle vertical erected at M,

h is the distance between the point C and the horizontal line M F,

r is the distance between the point of suspen- -sion A0 and the centre M of the ring balance,

e is the angle F' A C (A F horizontal), is the angle B C A. The following equations hold:-

All the values of the equation I are in terms of the angle of displacement a. By substituting the values for 'y and from the equations II-IV in the Equation I an equation is obtained for T in which the angle of displacement is the only variable and the values G, a, b, e, h, r are constants. For determining whether any positive function is obtainable between the measuring force T and the displacement m according to the present invention--the formula. V for example required for measuring ow,

T= Ca2,

is substituted for Equation I, so that only the aforementioned constants and the functions of the angle will appear. Substituting for a five different valies proportionally distributed within the measuring range, flve equations may be obtained from which the constant values a, b, e, h., r can be calculated. G and c may be neglected in the calculation. If no real solutions are obtained it shows that the function cannot be proved. However it probably will be possible to prove the function if real values are obtained for the different constants. Whether the relation required holds for the whole range is determined by substituting other values for a. By applying graphical methods the solution of the equations is made simpler than appears from their intricate form.

The dimensions of the guide links a and b, the position of the point C and the distance r between the suspension point Ao and the centre M have been thus calculated for a ring balance for meas- .uring the difference in pressure existing across an orice plate or the like and which indicates or records the value of the square root of the difference in pressure. The dimensions are indicated by means of a diagram in Figure 3. It Will appear that within the range of measurement (d20-30) the effective tangential component increases with the second power of the angle of displacement a-nd owing to the equality of the work in turning the ring balance and in lifting the weight, the height to which the weight is raised mus-t increase by the third power of the `angle of displacement.l This is proved by measuring the perpendiculars from the points B1, Bz etc. to B10,

erected on the horizontal line M F in Figure 3. The dimensions can be calculated in the same way if a rectilinear relation between displacement and pressure is desired for simple pressure meters. By varying the dimensions the relation between measuring force T and displacement a can be considerably varied. Consequently many other functions Within the range of measurement can be proved, particularly if additional weights are secured to the guide links or to their extensions.

It will be understood from the foregoing that when the ring body R turns in counterclockwise direction the suspension point A moves. upwardly and the guide a lifts the weight G so that the guide b and the weight move in a circular path partly around the other suspension point C.

It will be understood that the eiect of the weight and the rotary movement of the ring scale is not simply proportional to the differential pressure of the gases, but it varies and it is increased beyond proportion if the differential pressure in- U' creases. This is effected by the double suspension of the weight G. The higher the weight is raised, the greater also is the counter-effect resisting the torsion of the balance.

What I claim is:

In measuring apparatus of the class described, in combination with a ring balance, a counterweight, a guide link connected to the ring balance and to the counterweight, and a guide link connected to the counterweight and to a xed point, spaced from the ring balance, so that the weight is caused to move, when the ring balance is deected, in a curved path outside the ring balance, to offer resistance to the movement of the ring balance. 125

PAUL RHEINLNDER. 

